Turbo Upgrade Questions

[S13CRAVE]

hey,
when i get my sr20det i wanna upgrade the stock turbo to a turbonetics T28 or T3/4 hybrid.  Which one is capable of more power and how much?  Also, what else would i need to upgrade besides injectors and a boost controller and turbo timer?  Any personal stories of use with them would also be great.  Thanx a lot guys.

[Gorath]

From what i have read the t28 came stock on the newer SRs and people would upgrade that to the t3/t4 so based on that the t3/t4 puts out more.  Extra stuff i would guess a better IC would be in line other then that i dont know.

[Kreator]

Well t3/t4 is capable of more power. As for the parts you need along with the turbo, that mostly depends on how much boost you are going to run. If you are going to keep the same boost, you probably won't have to change anything. If you are gonna turn it up, then u gotta change injectors, buy boost controller, FM system, change MAF(?), probably change engine bottom end (300hp+) and probably modify rear end of the car... but the last 2 are not necessary for up to 300hp. Hope that helped... can't think of anythin else.

Kre

[DSC]

Kreator, what do you mean by "modify rear end of the car"? You mean like gearing or what?

Also s13crave, before you go turbo I'd recommend reading up a bit more on it. Maxium Boost (http://www.amazon.com/exec/obidos/ASIN/0837601606/qid%3D1017905736/ref%3Dsr%5F11%5F0%5F1/104-7009087-8955919) is a book a lot of people say is really good for learning about turbos. And for some more basic turbo reading How stuff works turbo article (http://www.howstuffworks.com/turbo.htm)

[luey02]

to run above 7psi, you need to upgrade injector, fuel pump/filter, maf, wastegate (with new turbo), ecu (to read new maf).  

INtercooler you should get a nice one good for your hp goal..
My suggestion for internals would be 350 crank hp.

[Kreator]

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (DSC @ April 04 2002,01:40)</td></tr><tr><td id="QUOTE">Kreator, what do you mean by "modify rear end of the car"? You mean like gearing or what?

Also s13crave, before you go turbo I'd recommend reading up a bit more on it. Maxium Boost (http://www.amazon.com/exec/obidos/ASIN/0837601606/qid%3D1017905736/ref%3Dsr%5F11%5F0%5F1/104-7009087-8955919) is a book a lot of people say is really good for learning about turbos. And for some more basic turbo reading How stuff works turbo article (http://www.howstuffworks.com/turbo.htm)</td></tr></table><span id='postcolor'>
Well, a couple of days ago I would mean exactly that. But yesterday a friend of mine said that for high hp (400-500) you gotta mod "the whole rear end". First I thought that he meant exactly the gear ratios. But he said that you gotta change the whole tranny/drivetrain/gearratio thing. I don't know how valid that is, so if anyone can clarify that, I'd be thankful.

Kre

[boosteds14]

WELL, u wouldnt need to change the rear-end unless it breaks from all stress from the high HP!
people also say to do this because its the rear-end that looses hp to the rear wheels. therefore, modifing this can close the gap of horse power lost from the flywheel to the rear wheels. the 240sx has a very strong rear-end, but not as strong as mustangs and camaros but can handle a bit of hp until it really starts to shit the bed

[S13CRAVE]

i thought i read that the T3/4 came with an internal wastegate? &nbsp;I also saw in the SCC that the bottom end of the S13 RedTop can safely handle up to 400hp, is this true? &nbsp;Thanx for the help. &nbsp;Any extra info or tips would be cool too.

[boosteds14]

the t3/t4 can come w/ internal and external wastegate. your choice when ordering

[S13CRAVE]

is it safe to get one off ebay like if the guy has a good member rating? &nbsp;i've seen real nice polished ones one there. &nbsp;How can i tell whether or not the on ebay has a wastgate on it or is internal? &nbsp;Thanx again.

[thewholefnshow]

Email and ask, the problem with a lot of Ebay sellers is they are GREAT salespeople and will get good ratings. But they just tell you what the box tells them is inside, which is not always right. You need to talk to the person and disern whether they know what they are talking about or not. That is really the only way... ebay is a crap shoot, so make sure you really study up on it....

Other than that, ever since reading in SS about that Blitz S15, I have been looking into the Blitz K27 Turbo... THAT is an impressive little thing...

[junia]

If you're going to get a turbo upgrade you might as well get the bigger one now because if you don't, you'll want to upgrade it again. &nbsp;About the stock bottom end, all I can say is that they're pretty good up to around 350-400HP but anything after that I would atleast get the block internals balanced out. &nbsp;For the head, &nbsp;its a good Idea to pick up some rocker arm stoppers because they do and will pop off at the worst time(like when you're up at around 8000rpm), &nbsp;You can either get this from one of the aftermarket companies or from nissan because the sr20 from the pulsar gti-r came stock with those. &nbsp;Also if you're running high HP you'll want to either get rid of the MAF or get one off of a Z32. &nbsp;I've read that the Z32 mafs are good up to around 400-500 Horses and thats why you see GTR's with two Z32 mafs running off of a one turbo configuration. &nbsp;You'll want to upgrade the injectors to atleast 550cc, &nbsp;Some people just add secondary injectors near the intake but its hard to tune your car with that because you don't get an even dispersion of fuel to your combustion chambers. &nbsp;Now, about the rear end, I've only seen one instance of this happening but, I knew a guy that had a CA powered silvia that pushed 500+ HP and He snapped his drive shaft but that was just that one extreme case. &nbsp;I don't know what you have to do to beef up the rear end but no one I've seen even bother with that, they would just run with the stock rear with the stock vlsd so I wouldn't worry too much about the rear end. &nbsp;Maybe if you get a high Hp engine you might wanna try and play around with the final gears like the one from a 300zx tt but I don't what kind of results you'll get with that. &nbsp;Maybe someone else might know.... <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'>

[Kreator]

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (boosteds14 @ April 04 2002,09:29)</td></tr><tr><td id="QUOTE">WELL, u wouldnt need to change the rear-end unless it breaks from all stress from the high HP!
people also say to do this because its the rear-end that looses hp to the rear wheels. therefore, modifing this can close the gap of horse power lost from the flywheel to the rear wheels. the 240sx has a very strong rear-end, but not as strong as mustangs and camaros but can handle a bit of hp until it really starts to shit the bed</td></tr></table><span id='postcolor'>
Well that's basicly what my friend told me. He said that it will break at that power (we were talking about 450-500rwhp) so if I didn't want that to happen i should beef it up. So that's what i meant up there. <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'>

As for the ebay, personally i won't buy anything off the ebay for more than $150. Even the cars, i'd rather check it out before bidding on it.

junia, could you go abit deeper into the rocker arm thingy? I'm sorta confused on how they might flyout <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/confused.gif" border="0" valign="absmiddle" alt='???'> Or just pm me. Thanx

[junia]

Unnggghhhh..... <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/confused.gif" border="0" valign="absmiddle" alt='???'> &nbsp; I don't know how to explain. &nbsp;I wish I had a head from a SR20 sitting in front of me. &nbsp;I've read about the the rocker arms coming off in many many magizines and books and just stuff that were SR20 oriented. &nbsp;I know what the rocker arm stoppers look like. They're sort of like a guard that runs the length of the head and they just make sure the rocker arm stays in place. &nbsp;Heres what I'll do, I'll dig through all my magazines and see if I can find a picture. I know theres one somewhere and I'll scan it or I'll just look for one on the net.. <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'>

[Drifting Ricer]

I think his talking about the Big T28. That turbo can make 330HP at 20PSI. It's a modified t25 or t28. It can spool faster then the t3/t4 hybrid. But it's power limit his around 330HP. I don't know how much a t3/t4 can hold, but you don't want to go over 350HP on stock internals on a SR. That’s what I keep hearing anyways.

[Drifting Ricer]

By the way you need to upgrade you're fuel system before going to 20PSI.

like cobra maf
550 injecters
retuned ECU.
clucth too.

you can run a Big t28 turbo on stock fuel system. But only at 7psi.

[crazycuban]

Whoa guys...you don't need that much shit.

Don't get a T28 - unless it's a big 28. Go with a T3/T04B, or T3/T04E...call turbonetics a few times, they'll give you a few different answers as to what you need to what you want, and pick the ony you like the best...thats what I did at least.

All you need to upgrade is:
Turbo
Manifold (you could risk it and have a shop weld a new flange onto the stock manifold, and hope that it fits)
Wastegate (go external wastegate)
Injectors or Fuel Pressure Regulator (FPR is cheaper)
Probably a custom hot pipe
Boost controller

With FPR, I've seen people with stock injectors go into the mid-300's.

EDIT: &nbsp;That's assuming your car isn't totally stock, and you've done the shit like FMIC and fuel pump.

[sykikchimp]

Stock injectors, and fuel management is good to 14psi on the SR. &nbsp;Unless you go over that, theres really no reason for all that other nonsense. &nbsp;I've read that the Stock 240 Drivetrain should be good to 450hp. &nbsp;

You can usually tell if it's internally wastgated by the exhaust opening on the turbo to the downpipe. &nbsp;The will be a seprator wall.

The benfit to going with the T28 is that you can use the stock manifold b/c the flanges are the same. &nbsp;I'm pretty sure you can't just Buy a "big 28". &nbsp;It was a custom job for a guy over on FA. &nbsp;Different compressor wheel, and porting, etc...

[William]

I did all of your work for you. &nbsp;a T3/T04E with a 50 Trim wheel and .50 housing is perfect. &nbsp;Go with a .63 to .82 turbine housing depending on how much lag you want. &nbsp;That setup should support around 350 to the wheels.

[Kreator]

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (crazycuban @ April 04 2002,11:53)</td></tr><tr><td id="QUOTE">Whoa guys...you don't need that much shit.

Don't get a T28 - unless it's a big 28. Go with a T3/T04B, or T3/T04E...call turbonetics a few times, they'll give you a few different answers as to what you need to what you want, and pick the ony you like the best...thats what I did at least.

All you need to upgrade is:
Turbo
Manifold (you could risk it and have a shop weld a new flange onto the stock manifold, and hope that it fits)
Wastegate (go external wastegate)
Injectors or Fuel Pressure Regulator (FPR is cheaper)
Probably a custom hot pipe
Boost controller

With FPR, I've seen people with stock injectors go into the mid-300's.

EDIT: That's assuming your car isn't totally stock, and you've done the shit like FMIC and fuel pump.</td></tr></table><span id='postcolor'>
So whats a "big 28"? How much hp can you get from still being quite safe? Is it more powerfull than the T04B/T04E?

[S13CRAVE]

Thanx everyone for all the help/advice. &nbsp;William...which turbine housing gives less lag? &nbsp;So i can get up to 350 at the wheels on stock internals? &nbsp;Thats nuts. &nbsp;Just to be safe, what should i upgrade internally that wont be ass-rapingly expensive? &nbsp;Thanx again.